Injectateless thermal cardiac output determination method and apparatus

摘要: The method and system use a catheter that is configured such fluid may circulate within it. With the in position, down one lumen as far RA or RV, over to another back up out of catheter. Nothing injected into bloodstream. On this catheter, temperature sensor positioned PA monitor mixed venous blood temperature. Temperature devices at inlet outlet from flowrate circulation controlled known value monitored. circulating preferably cooled near ice prior input This flow rate are held relatively constant. Soon after initiated steady state heat transfer attained. cools through walls. It also any adjacent lumens which cool their walls dilution, if used introduce an IV solution. An appropriate balance equation allows cardiac output be calculated. After amount data collected, discontinued, allowing re-equilibrate. Once equilibrium reestablished, measurement cycle initiated.